Fixed non-functioning default value for CCUserDefault::getDoubleForKey()

- defaultValue was not being passed into the JNI CallStaticDoubleMethod
method previously.
-  CCUserDefault::getDoubleForKey() would return undefined garbage when
the key doesn’t exist.
Test Case:
Call the following from anywhere in your code (in release
configuration). X will be garbage.
Call the following from your code:
double x =
CCUserDefault::sharedUserDefault()->getDoubleForKey("Some-Non-existant-k
ey-1234", 0);
CCLOG("x = %4.2f", x);

Fix Tested on Android. Affects Android only.